My eyesight is not good.
I have my Zumo mounted on the bars just below the clutch perch. It is close to me and tilted up.
In bright sun I can not read it unless I bend forward to shade it. I am 63, so, it is not much of a problem for me.
On my GS I could mount the unit on the windscreen support and shade it. But I think the unit would be so far from me I could not read it. Guys do mount their GPSs there and it looks like a very good place to do it.

__________________
I've got to be cool
Relax
Take a long long ride on my motor bike
Untill I'm ready

if you want to have a GPS with a realy bright display, that is readable in sunlight get the Garmin 60CSX. Have it mounted on my Tenere and it reads good in bright sunlight, because it has a transrefelctive Display (the more light it gets , the brighter it is). 60CSX can Autoroute as well. For me the perfect GPS on an enduro.
greets from germany
Michael

if you want to have a GPS with a realy bright display, that is readable in sunlight get the Garmin 60CSX. Have it mounted on my Tenere and it reads good in bright sunlight, because it has a transrefelctive Display (the more light it gets , the brighter it is). 60CSX can Autoroute as well. For me the perfect GPS on an enduro.
greets from germany
Michael